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Re: [sdpd] standard reference material for neutron diffraction
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<p>Dear Bensemma Nouar,<br>
<br>
The simple answer is yes, you can use those designed for X-ray<br>
diffraction. I would usually recommend a material with cubic symmetry<br>
such as Si or Ni powder or an oxide such as CeO2 or Y2O3 (but the<br>
latter needs to be well annealed). It depends a bit on what sort of<br>
calibration you want to do, e.g. wavelength, detector<br>
response/efficiency<wbr>, etc. If it just wavelength, then you don't need<br>
many peaks so a strong scatterer based on a single element is probably<br>
best. Cubic oxides, especially Y2O3, will provide more peaks for<br>
instrument calibration, e.g. detector response. An alternative<br>
calibration material for detector response only (e.g. for PSD<br>
detectors) is to use an incoherent scatterer that provides a flat<br>
signal, usually a solid rod of vanadium metal works best for this, but<br>
beware of single crystals in the rod giving rise to tiny Bragg peaks.<br>
<br>
Jeremy Karl.<br>
------------<wbr>---------<wbr>---------<wbr>-------<br>
Dr Jeremy Karl Cockcroft<br>
Admissions Tutor: Natural Sciences (2008-2011)<br>
Department of Chemistry<br>
(University College London)<br>
Christopher Ingold Laboratories<br>
20 Gordon Street<br>
London WC1H 0AJ<br>
+44 (0) 20 7679 1004 (laboratory)<br>
<a href="mailto:j.k.cockcroft%40ucl.ac.uk";>j.k.cockcroft...@<wbr>ucl.ac.uk</a><br>
<a href="http://img.chem.ucl.ac.uk/www/cockcroft/homepage.htm";>http://img.chem.<wbr>ucl.ac.uk/<wbr>www/cockcroft/<wbr>homepage.<wbr>htm</a><br>
<br>
2009/4/1 bensemma nouar <<a href="mailto:bensemma%40yahoo.fr";>bensemma...@yahoo.<wbr>fr</a>>:<br>
><br>
> Dear Rietveldians and SDPDists!<br>
><br>
> i would like to know what standard can i utilize for the calibration of<br>
> neutron diffractometer ? can i utilize those designed for x ray diffraction?<br>
><br>
> [Non-text portions of this message have been removed]<br>
><br>
> <br>
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